NPPES file of Aug 9, 2026

Hematology (Internal Medicine) Physician in California

175 NPPES records list hematology (internal medicine) physician with a practice address in California, 0.4 per 100,000 residents, the 15th highest rate of 48. Duarte and Stanford have the most; each record links to the provider's NPI and the California license search. Page 4 of 4.

CMS NPPES registry, file of Aug 9, 2026; 2023 Census estimates · NUCC 207RH0000X · method

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

Duarte has the most, 61

  1. Duarte61
  2. Stanford44
  3. San Francisco15
  4. Los Angeles14
  5. San Diego8

Hematology (Internal Medicine) Physician records in California

  1. Parveen Shiraz, MDStanford, CA 943051982754784
  2. Judith Shizuru, MD,PHDStanford, CA 943051003942251
  3. William Shomali, M.DStanford, CA 943051407113871
  4. Geoffrey Shouse, D.O., PH.D.Duarte, CA 910101568721116
  5. Surbhi Sidana, M.D.Stanford, CA 943051972868644
  6. Tanya Siddiqi, M.D.Duarte, CA 910101467408948
  7. Tammarah SklarzLa Jolla, CA 920371013570241
  8. Eileen Smith, MDDuarte, CA 910101679680466
  9. Melody Smith, MDStanford, CA 943051790915031
  10. David Snyder, MDDuarte, CA 910101093800898
  11. Adam Sperling, MD, PHDStanford, CA 943051023303161
  12. Anthony Stein, MDDuarte, CA 910101225046147
  13. Forrest Stewart, MDDuarte, CA 910101750436788
  14. Thomas Sweet, MDSan Diego, CA 921301164581732
  15. Swetha Thiruvengadam, M.D.Duarte, CA 910101285054940
  16. Anil Tulpule, M.D.Los Angeles, CA 900891710913249
  17. Layla Van Doren, MDSan Francisco, CA 941431467897967
  18. Richard Vanetten, MDOrange, CA 928681760536841
  19. Hyma Vempaty, MDStanford, CA 943051750389250
  20. Jared Wallace, MDStanford, CA 943051760010987
  21. Chiaching Wang, MDSan Francisco, CA 941431922260520
  22. Ilene Weitz, M.D.Los Angeles, CA 900891790715399
  23. Kamehameha Wong, MDDuarte, CA 910101538276316
  24. Jasmine Zain, MDDuarte, CA 910101043327075
  25. Tian Zhang, MDStanford, CA 943051760771737

Source: CMS NPPES, primary taxonomy 207RH0000X: records by practice city and the list of records, file of Aug 9, 2026.

California ranks 15 of 48 per resident

  1. Michigan0.6
  2. Maryland0.5
  3. Pennsylvania0.5
  4. California0.4
  5. Washington0.4
  6. Maine0.4
  7. 50 states and D.C.0.4

Source: CMS NPPES, primary taxonomy 207RH0000X by practice state, file of Aug 9, 2026; records per 100,000 residents, 2023 Census estimates.

89.1% of these records appear in a Medicare file, against 80.5% nationally

A Medicare file here is Part D prescribing (2024), a MIPS score (2023), an Open Payments record (2024) or Medicare group billing (CMS Doctors and Clinicians). A record outside them may still see patients: these files cover Medicare only.

  1. California89.1%
  2. United States80.5%

Hematology (Internal Medicine) Physician records in California, measured

  • In a Medicare file156 of 175 · 89.1% here, 80.5% nationally
  • In the CMS Doctors and Clinicians file136 · 77.7% here, 70.8% nationally
  • Not updated in five years or more59 · 33.7% here, 46.9% nationally
  • Median graduation year2006 · the 135 records with a school on file

Source: CMS NPPES, file of Aug 9, 2026 (primary taxonomy 207RH0000X); CMS Medicare Part D Prescribers 2024, MIPS 2023, Open Payments 2024 and Doctors and Clinicians, matched by NPI.

What the count covers

175 NPPES records list hematology (internal medicine) physician (207RH0000X) as their primary taxonomy with a practice address in California: 0.4 per 100,000 residents against 0.4 nationally (50 states and D.C.). Duarte has 61 of them (35%).

A record is a registration a provider made and keeps up to date: it shows neither that the provider is licensed nor that they still practice there. The state's own license search is the check.

States with a similar number

  1. New York161
  2. Minnesota128
  3. Massachusetts117
  4. Ohio89

States with a similar rate per 100,000

  1. Washington0.4
  2. New Jersey0.4
  3. Pennsylvania0.5
  4. Illinois0.4

The largest states

  1. New York161
  2. Minnesota128
  3. Massachusetts117
  4. Ohio89
  5. Texas73

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy; 2023 Census population estimates. A registry record is not a license.

Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.